Update axis-chart-utils.js

[scottfr]

Fix issue with overlapping labels on series charts.

Explanation About What Code Achieves:

Fixes the series chart overlapping label issue here:

#158

The issue was caused by the label overlapping logic only showing every Nth label. However N could change for each unique label length resulting in strange overlaps when the label length would change.

We now just choose one label length (the longest label) and use that throughout for spacing.

Screenshots/GIFs:

See here for a screenshot of the issue:

#158

Steps To Test:

Create a series chart with labels that have a different number of characters. View before and after this change

TODOs:

• None

[coveralls]

Pull Request Test Coverage Report for Build 157

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 38.158%

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Totals
Change from base Build 156:	0.0%
Covered Lines:	29
Relevant Lines:	62

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💛 - Coveralls